Positive test charge e qo placed at that point

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Unformatted text preview: a n acceleration – and call it field Electric Field – Definition •  The electric field is defined as the electric force on the test charge per unit charge , •  The electric field vector E , at a point in space is defined as the electric force F , acting on a positive test charge, , e qo placed at that point divided by the test charge: E = Fe / q Electric fields Force: F = qE Q E=k 2 r + – Units: N/C Point away from positive charges and towards negative charges Indicates the direction that a + charge (q) would travel due to the source charge (Q) Electric Field, Vector Form •  Remember Coulomb s Law, between the source and test charges, can be expressed as Fe = ke Qq r 2 ˆ r Then, the electric field will be Fe Q ˆ E= = ke 2 r q r Qi ˆ E = ke ∑ 2 ri i ri Electric Field Lines •  Field lines give us a means of representing the electric field pictorially •  The line has a direction that is the same as that of the electric field vector •  The number of lines per unit area through a surface perpendicular to the lines is proportional to the magnitude of the electric field in that re...
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